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| All Patents in class 248/181.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,559,925 | Jul. 10, 1951 | C.W. Barker | Work holder device | bench vises | |
| 2,673,054 | Mar. 23, 1954 | J.W. Slavik | Ball and socket support for work holders | vises | |